Czervionke L F, Czervionke J M, Daniels D L, Haughton V M
Department of Radiology, Medical College of Wisconsin, Froedtert Memorial Lutheran Hospital, Milwaukee 53226.
AJR Am J Roentgenol. 1988 Dec;151(6):1219-28. doi: 10.2214/ajr.151.6.1219.
Truncation artifacts occur in MR imaging because Fourier transforms are used to process MR signal data. These artifacts may alter the intensity, shape, and anatomic detail of structures in the spine. Ring artifacts (Gibb phenomenon) occurring near highly contrasting interfaces represent but one manifestation of truncation artifacts visible on MR images. We review truncation phenomena by providing graphic and phantom models. Ways in which truncation artifacts alter the MR appearance of the spine are discussed. We found that truncation phenomena are reduced most effectively by using a 256 x 256 matrix whenever feasible.
截断伪影出现在磁共振成像中，因为傅里叶变换用于处理磁共振信号数据。这些伪影可能会改变脊柱结构的强度、形状和解剖细节。在高对比度界面附近出现的环形伪影（吉伯现象）只是磁共振图像上可见的截断伪影的一种表现形式。我们通过提供图形和模型来回顾截断现象。讨论了截断伪影改变脊柱磁共振表现的方式。我们发现，只要可行，使用256×256矩阵能最有效地减少截断现象。
